Java Programming Practice Guide | Exam-Focused Practice Questions with Solutions and Code Examples

Java Programming Practice Guide
High-Demand Exam Prep • American English • 100% Original




Introduction to Java Practice.
This guide provides structured Java programming practice designed to help students strengthen their
understanding of fundamental and intermediate Java concepts. Every section includes practice questions
followed by clear, student-friendly explanations written in American English. These exercises are original,
exam-focused, and ideal for assignment preparation.


Java remains one of the most widely used programming languages in universities and technical courses.
Students frequently struggle with core concepts like loops, arrays, object‑oriented programming, and file
handling; therefore, this material offers simplified examples plus hands‑on problem‑solving.




Java Basics: Variables, Data Types, Operators:

1. Practice Questions.

1. Declare variables to store a student’s name, age, and GPA. Assign sample values.
2. Develop a Java application for converting temperature from Celsius to Fahrenheit.
3. Create a Java expression using arithmetic operators to calculate the area of a rectangle.
4. Explain the difference between int , double , and boolean data types.
5. Predict the output of:


int x = 7;
int y = 3;
System.out.println(x % y);


2. Solutions & Explanations.

• A variable stores data in memory. Data types determine the kind of information stored (numbers,
characters, decimals).
• Output of 7 % 3 is 1 because the modulus operator returns the remainder.
• Conversion formula: fahrenheit = (celsius * 9/5) + 32;




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, Conditional Statements (if/else, switch):

Practice Questions.

1. Write a program that checks whether a number is positive, negative, or zero.
2. Use a switch statement to print the name of the day based on a number (1–7).
3. What is the difference between if and switch ?
4. Predict the output:


int a = 10;
if(a > 5) {
System.out.println("High");
} else {
System.out.println("Low");
}


Solutions

• The output above is High because 10 > 5.
• if handles a wide range of conditions, while switch is preferred for fixed choices like menu
selections.




Loops (for, while, do‑while):

Practice Questions

1. Print the numbers from 1 to 50 using a for loop.
2. Create an application that sums the first ten natural numbers.
3. What is the difference between while do‑while loops?
4. Predict the output:


int i = 3;
do {
System.out.println(i);
i--;
} while(i > 0);


Solutions

• do‑while guarantees the loop runs at least once.
• The above program prints: 3 , 2 , 1 .




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